CA1102552A

CA1102552A - Traveling band sharpener

Info

Publication number: CA1102552A
Application number: CA324,927A
Authority: CA
Inventors: Howard R. Longbrake
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-04-24
Filing date: 1979-04-05
Publication date: 1981-06-09
Also published as: AU4634479A; AU536801B2

Abstract

TRAVELING BAND SHARPENER
ABSTRACT

A traveling band sharpener for knives, arrowheads, and the like, having an endless abrasive belt looped about a pair of pulleys one of which is power driven, and a detachable workholder for positioning the work in optimum position relative to the belt for sharpening on the belt and a hand manipulating sharpening device in optimum position relative to the work for subsequent finish sharpening of the work by hand after removal of the workholder and work from the machine.

Description

~;2 The invention relates to traveling band sharpening machines.
Prior to the present invention knives and the like were usually sharpened on machines employing rotating abrasive wheels as the sharpening element. Such machines typically depended on the skill of the operator to produce the optimum bevels on the cutting edge of the work or were limited to producing a predetermined level on the work at the cutting edge.
The invention provides a novel and improved traveling band sharpening machine including a removable workholder which positions a workpiece, such as, a knife, arrowhead, etc., in optimum or selected position relative to the traveling band for rough grinding or sharpening and a hand manipulable sharpening tool relative to the workpiece for subsequent -hand or finish sharpening of the workpiece upon removal of the workholder from the n,achine with the workpiece attached thereto.
In one broad aspect, the invention resides in a sharpening machine for sharpening workpieces, such a~, knives, arrows, and the like, said machine comprising an abrasive belt reeved about two pulleys at least one of which is power driven, said pulleys being journaled in a frame assembly a part of which is adjustable for tensioning said belt, and a projection on said frame for the connection thereto of a workholder having clamp members providing parallel clamp surfaces movable towards and from one another and parts ex-tending generally normal to the planes of the clamp surfaces having at least one aperture therein at opposite sides of the centerplane between said clamp members and equal distances therefrom for the reception of said projection on said frame .~

' . ~ . ' . ~ ~ ' ~\ :

whereby a workpiece clamped in said workholder by said clamp members may be selectively located in either of two predetermined positions relative to said belt.
The drawing illustrates one embodiment of the invention.
The sharpening machine shown in the drawing is a bench or table top machine comprising a continuous abrasive belt 10 reeved about pulley wheels 12, 14 rotatably supported in a frame 16 supported on a base 18. The pulley 12 is driven by an electric motor 20 also on the base 18 and connected to the shaft 22 which carries the pulley 12 by a V-belt drive designated generally by the reference character 24. The idler pulley 14 is rotatable on a slide 26 forming part of the frame 16 for adjustment towards and from the pulley 12 so that the belt 10 can be tensioned, as desired.
The belt 10 in the depicted machine is about one and one-half inches (1.5"), or about three and eight tenths centimeters (3.8cm) wide and the pulleys 12, 14 about ten inches (10"), or about twenty-five and four tenth centimeters (25.4 cm) apart, but belts of other sizes may be employed.
The abrasive material or part of the belt 10 may be of any suitable material.
The instrument or work to be sharpened, for example, a hunting knife shown in the drawing, is connected to a work-holder similar to the workholder shown in United States patent No. 3,819,170, the disclosure of which is incorporated herein by reference. The workholder comprises two plate-like clamp -members 32, 34, loosely connected to one another by a screw 36 threaded into a tapped aperture in the member 34. The ends of the members 32, 34 at one side of the screw 36 serve as clamp surfaces to clamp a work between them and the other ends of the members 32, 34 are forced apart by a screw 40 threaded into a tapped through aperture in the member 32 intermediate the screw 36 and the end of the member 32 opposite the clamp end thereof. The exposed end of the shank of the screw 40, that is, the end opposite to the end threaded into the member 32 is provided with a knurled head for ease of manipulation. The end of the screw 40 threaded into the member 32 extends therethrough and abuts the member 34. The clamp ends of the members 32, 34 provide generally parallel 10 planar surfaces preferably slightly tapered inwardly toward the other ends of the members to better secure the work between them.
The workholder also comprises two plate-like members 42, 44 provided with right angle flanges at their ends ad~acent to the members 32, 34 by which they are connected to the sides of the members 32, 34, respectively, facing away from one another and at the ends thereof remote from clamp ends of the member by screws 46 threaded into tapped apertures in the members 32, 34. The members 42, 44 extend generally at right angles to the members 32, 34 and the clamp surfaces 20 of the members to which they are attached and are provided with series of apertures 50, 52, respectively, in the depicted worholder three, spaced different distances from the members 32, 34. A rod or pin-like member 54 connected to the slide member 26 of the frame 16 of the machine is adapted to be loosely received in one or another of the apertures 50, 52 to locate a workpiece, such as, the knife A clamped in the workholder, in a selected and/or predetermined optimum position for sharpening. The members 32, 34 are duplicates of one another except for the threaded apertures therein which receive 30 the screws 36, 46 as are the members 42, 44 thus making it .

' . . ' ' - . -:' ' . - ' :
~ ^ : - : .

convenient to sharpen both sides of a workpiece without re- -moving it from the workholder by merely inverting the work-holder and workpiece as a unit.
Subsequent to grinding or sharpening the cutting edge of the workpiece on the belt 10 the workpiece together with the workholder can be removed from the machine and the cutting edge further or finished sharpened by hand, for example, by use of a tool, such as, the file and/or honing stone. During the hand finishing one or another of the apertures 50, 52 services as a guide for the hand tool, lo-cating the tool in the optimum position for the desired sharpening operation.
While the depicted machine is of the bench or tabletop types which facilitates its movement from one place to another and in this respect adds to its flexibility the invention may be otherwise embodied.
From the foregoing description of the depicted apparatus it will be apparent that the objects of the invention heretofore mentioned and others have been accomplished and that a simple, rugged sharpening machine has been provided which facilitates sharpening the cutting edge of a workpiece to a desired level.

,.~, .

.

Claims

The embodiments of the invention in which an exclu-sive property or privilege is claimed are defined as follows:

1. A sharpening machine for sharpening workpieces, such as, knives, arrows, and the like, said machine comprising an abrasive belt reeved about at least two pulleys at least one of which is power driven, said pulleys being journaled in a frame assembly a part of which is movable for tensioning said belt, and a projection on said frame for the connection thereto of a workholder having clamp members providing parallel clamp surfaces movable towards and from one another and parts extending generally normal to the planes of the clamp surfaces having at least one aperture therein at opposite sides of the centerplane between said clamp members and equal distances therefrom for the reception of said projection on said frame whereby a workpiece clamped in said workholder by said clamp members may be selectively located in either of two prede-termined positions relative to said belt.

2. A sharpening machine for sharpening workpieces, such as, knives, arrows, and the like, said machine comprising an abrasive belt reeved about at least two pulleys at least one of which is power driven/ said pulleys being supported in a frame assembly a part of which is movable for tensioning said belt, a protection on said frame, a workholder having clamp members providing parallel clamp surfaces movable towards and from one another and parts extending generally normal to the planes of the clamp surfaces, said parts of said clamp members having at least one aperture therein at each opposite side of the centerplane between said members and equal distances thereform for the reception of said projection on said frame whereby a workpiece clamped in said workholder by said clamp members may be selectively locked in either of two prede-termined positions relative to said belt.